Heat dissipation device having a fan thereon

ABSTRACT

A heat dissipation device includes a heat sink and a blower. The heat sink has a base and a plurality of fins formed on the base. The blower includes a frame and an impeller rotatably secured to the frame. The frame faces and is secured to the base of the heat sink to define an airflow passage between the base of the heat sink and the blower. An airflow inlet is defined through the frame of the blower. Another airflow inlet is defined through the base of the heat sink. An airflow produced by the blower passes through the airflow passage via the airflow inlets and then blows towards channels defined between the fins of the heat sink.

BACKGROUND

1. Technical Field

The disclosure relates generally to a heat dissipation device forremoving heat from an electronic component mounted on a periphery card,and particularly to a heat dissipation device comprising a blower facinga base of a heat sink in contact with the electronic component to definean airflow passage between the base of the heat sink and the blower,wherein airflow can pass through the airflow passage.

2. Description of Related Art

It is well known that during operation computer electronic devices suchas central processing units (CPUs) can generate large amounts of heat.The heat must be quickly removed from the electronic device to preventit from becoming unstable or being damaged.

Thus, a heat dissipation device which can quickly remove the heat fromthe electronic device is needed. Such a heat dissipation device isparticularly necessary for a periphery card of a computer, for example,a video graphic array (VGA) card. A periphery card is usually crowdedwith other periphery cards whereby only a limited space is available foran airflow to flow through a heat sink thereof. The heat dissipationdevice usually includes the heat sink and a blower mounted to the heatsink. Since the periphery card has a limited space, accordingly, theheat sink is designed to have a flat-shaped base and fins with a limitedheight. The blower is desired to guide airflow to pass through the finsof the heat sink from one side to an opposite side thereof.

However, the blower usually includes a fan frame and a cover coveringand mounted to the fan frame. Airflow produced by the blower only flowsalong a passage cooperatively defined by the fan frame and the cover ofthe blower. That is to say, when the blower is mounted to the base ofthe heat sink, the airflow produced by the blower fails to directly blowtowards the base of the heat sink under the blower, the heat accumulatedat the base of the heat sink under the blower fails to be quicklydissipated.

What is needed, therefore, is a heat dissipation device which has ablower to directly blow towards the base of the heat sink.

BRIEF DESCRIPTION OF THE DRAWINGS

Other advantages and novel features of the disclosure will become moreapparent from the following detailed description of anembodiment/embodiments when taken in conjunction with the accompanyingdrawings.

FIG. 1 is an exploded, isometric view of a heat dissipation device inaccordance with an embodiment of the disclosure.

FIG. 2 is an assembled view of the heat dissipation device of FIG. 1.

FIG. 3 is a similar view of FIG. 1, with arrows showing paths of airflowentering and leaving the heat dissipation device.

DETAILED DESCRIPTION

Referring to FIGS. 1-3, a heat dissipation device in accordance with anembodiment of the disclosure is shown. The heat dissipation device ismounted to a heat-generating electronic element (not shown) to dissipateheat from the heat-generating electronic element. Particularly, theheat-generating electronic element is a graphic processing unit (GPU)mounted on a periphery card of a computer, for example, a video graphicarray (VGA) card. The heat dissipation device comprises a heat sink 10,a blower 20 and a guiding plate 30.

The heat sink 10 is integrally formed by a metal with a good heatconductivity, such as copper or aluminum. The heat sink 10 comprises aflat base 12. The base 12 comprises three portions: a first portionlocated in a middle of the base 12, a second portion extending forthfrom an end of the first portion and a third portion extending rearwardsfrom an opposite end of the first portion. The first portion of the base12 has a semicircular shape with a size corresponding to that of theblower 20, for supporting the blower 20 thereon. A semicircular firstairflow inlet 120 is defined in the first portion of the base 12. A pairof mounting poles 16 is formed at two opposite ends of a front side ofthe first portion of the base 12, and another mounting pole 16 is formedon a middle portion of a top surface of the third portion of the base12, adjacent to the rear side of the first portion of the base 12. Eachmounting pole 16 defines a mounting hole 160 therein. A plurality offins 14 are integrally formed on a top surface of the second portion ofthe base 12. The fins 14 have a gradually increased lengths from a leftlateral side to a right lateral side of the second portion of the base12, wherein the fins 14 are located at a position and occupy a sizecorresponding to those of an outlet of the blower 20. Each fin 14defines a recessed edge at a top thereof and all recessed edges of allthe fins 14 cooperatively define a recessed slot 140 in a top of thefins 14. The front side 142 of the second portion of the base 12 underthe fins 14 is inclined downwardly in respect to the first portion ofthe base 12, wherein airflow from the outlet of the blower 20 blowingtowards channels defined between the fins 14 can be guided to downwardlyblow other heat-generating electronic elements mounted on the peripherycard and adjacent to the front side of the base 12 of the heat sink 10.

The blower 20 comprises a frame 22 and an impeller 24. The frame 22comprises a panel plate 220 and a lateral sidewall 222 downwardly andvertically extending from an edge side of the panel plate 220. Theimpeller 24 is rotatably secured to an inner surface of the panel plate220 of the frame 22. A plurality of second airflow inlets 2200 aredefined in the panel plate 220, corresponding to the first airflow inlet120 of the base 12 of the heat sink 10. Three fixing portions 224horizontal and outwardly extend from the lateral sidewall 222 and areevenly located along a periphery of the frame 22 of the blower 20,corresponding to the mounting poles 16 of the base 12 of the heat sink10. Each fixing portion 224 defines a through hole 2240 therein, inalignment with the mounting hole 160 of a corresponding mounting pole 16of the base 12 of the heat sink 10, for receiving a fastener 90extending therethrough. The fasteners 90 extend through the throughholes 2240 of the fixing portions 224 of the frame 22 of the blower 20and screw into the mounting holes 160 of the mounting poles 16 to mountthe frame 22 of the blower 20 on the first portion of the base 12 of theheat sink 10, wherein the base 12 of the heat sink 10 and the frame 22of the blower 20 cooperatively define an airflow passage along a lengthdirection of the base 12 of the heat sink 10 and the outlet of theblower 20 faces the channels defined between the fins 14 of the heatsink 10.

The guiding plate 30 has a size corresponding to that of a top surfaceof the fins 14 of the heat sink 10. The guiding plate 30 comprises amain body 32 and a recessed portion 34 extending outwardly anddownwardly from a front side of the main body 32. The guiding plate 30covers the top surface of the fins 14 with the recessed portion 34 beingreceived in the recessed slot 140 to guide the airflow from the outletof the blower 20 to downwardly flow to the channels defined between thefins 14 of the heat sink 10.

In operation, cooled airflow flows into the airflow passage between theframe 22 of the blower 20 and the base 12 of the heat sink 10 via thefirst and second airflow inlets 120, 2200, wherein the cooled airflowcan directly blow a top surface of the base 12 of the heat sink 10, soheat generated by the heat-generating electronic element attached on abottom of the base 12 of the heat sink 10 can be effectively taken away.

By provision of the frame 22 of the blower 20 engaging the base 12 ofthe heat sink 10, the blower 20 not only can directly blow the base 12of the heat sink 10, but also saves a cover covering the frame 22 todefine the airflow passage, whereby the cost of the blower 20 isdecreased. In addition, the base 12 of the heat sink 10 defines thefirst airflow inlet 120 therethrough, wherein the cooled airflow flowinginto the airflow passage via the first airflow inlet 120 can cause airaround the heat-generating electronic element to flow through theheat-generating electronic element; thus, the heat generated by theheat-generating electronic element can be taken away as quickly aspossible. Heat accumulated at the base 12 of the heat sink 10 under theblower 20 can be quickly dissipated.

It is to be understood, however, that even though numerouscharacteristics and advantages of the present embodiments have been setforth in the foregoing description, together with details of thestructures and functions of the embodiments, the disclosure isillustrative only, and changes may be made in detail, especially inmatters of shape, size, and arrangement of parts within the principlesof the invention to the full extent indicated by the broad generalmeaning of the terms in which the appended claims are expressed.

1. A heat dissipation device comprising: a heat sink comprising a baseand a plurality of fins formed on the base; and a blower comprising aframe and an impeller rotatably secured to the frame, the frame directlyfacing and mounted to the base of the heat sink to define an airflowpassage between the base of the heat sink and the frame, the framedefining an airflow inlet therethrough; wherein airflow produced by theblower flows into the airflow passage via the airflow inlet and blowstowards channels defined between the fins of the heat sink from anoutlet of the blower.
 2. The heat dissipation device of claim 1, whereinthe base of the heat sink defines another airflow inlet therethrough. 3.The heat dissipation device of claim 2, wherein the frame of the blowercomprises a panel plate and a sidewall extending from a peripherythereof and engaging the base of the heat sink to secure the frame tothe base of the heat sink.
 4. The heat dissipation device of claim 3,wherein the impeller is located between the panel plate and the base. 5.The heat dissipation device of claim 4, wherein the impeller is securedto a bottom surface of the panel plate and surrounded by the sidewall.6. The heat dissipation device of claim 3, wherein the frame of theblower comprises a plurality of mounting poles extending from thesidewall thereof, fasteners extending through the mounting poles of theframe of the blower and screwing into the base of the heat sink to mountthe blower on the base of the heat sink.
 7. The heat dissipation deviceof claim 6, wherein the base of the heat sink comprises a plurality offixing portions in alignment with the mounting poles of the frame of theblower, the fasteners extending through the mounting poles and screwinginto the fixing portions of the base of the heat sink.
 8. The heatdissipation device of claim 1, wherein the base of the heat sinkcorresponding to the fins is inclined downwardly to guide the airflow ofthe blower to flow downwardly away from the heat dissipation device. 9.The heat dissipation device of claim 8, wherein the fins of the heatsink have gradually decreased lengths from one of two opposite lateralsides of the base of the heat sink to another of the two oppositelateral sides.
 10. The heat dissipation device of claim 9, wherein thefins of the heat sink define a recessed slot in a top thereof and aguiding plate covers the fins and has a portion received in the recessedslot.
 11. A heat dissipation device comprising: a heat sink having abase and a plurality of fins extending upwardly from the base; a blowercovering the base of the heat sink, the blower comprising a frame facingand mounted to the base of the heat sink and an impeller rotatablysecured to the frame, the frame cooperating with the base to define anairflow passage between the frame and the base, an airflow inlet beingdefined in the frame of the blower; wherein an airflow produced by theblower passes through the airflow passage via the airflow inlet andblows towards channels defined between the fins of the heat sink. 12.The heat dissipation device of claim 11, wherein base of the heat sinkdefines another airflow inlet therethrough.
 13. The heat dissipationdevice of claim 12, wherein the base of the heat sink beneath the finsis inclined downwardly to guide the airflow to flow downwardly when theairflow leaves the heat dissipation device.